What is the problem?
The ST7567 datasheet says:
Serial interface (SPI-4) is also supported (write only)
The pins are clearly described. e.g. SDA, SCL, A0, CSB, RSTB.
SDA is just a generic term for "Serial Data" that often implies a bi-directional Data pin.
However this chip does not support read (SDO)
SDA may be used for I2C but I2C does not require A0, CS, RST pins.
The advertisement is misleading. I doubt that it is a TFT device. It certainly is
not an I2C device.
I suspect that U8g2 supports ST76567 SPI. e.g.
U8G2_ST7567_JLX12864_1_4W_HW_SPI(rotation, cs, dc [, reset]) [page buffer, size = 128 bytes]
David.